# -*- coding: utf-8 -*

import url_manager, html_downloader, html_parser, html_outputer


class SpiderMain(object):
    def __init__(self):
        #url管理器
        self.urls = url_manager.UrlManager()
        #下载器
        self.downloader = html_downloader.HtmlDownloader()
        #解析器
        self.parser = html_parser.HtmlParser()
        #输出器
        self.outputer = html_outputer.HtmlOutputer()


    def craw(self, root_url):
        count = 1
        # 添加原始url
        self.urls.add_new_url(root_url)
        
        # 查看url管理器中是否有新的url
        while self.urls.has_new_url(): 
            # 如果有新的url
            try:
                # 取出一条新的url
                new_url = self.urls.get_new_url()
                print 'craw %d : %s' % (count, new_url)

                # 对该url进行下载, 获取html内容
                html_cont = self.downloader.download(new_url)

                # 解析url
                new_urls, new_data = self.parser.parse(new_url, html_cont)

                # 添加新的url
                self.urls.add_new_urls(new_urls)
                
                # 输出器添加数据
                self.outputer.collect_data(new_data)

                if count == 3:
                    break
                
                count = count + 1 
            except:
                print 'craw failed'
        
        self.outputer.output_html()

if __name__=="__main__":
    root_url = "https://baike.baidu.com/item/Python/407313"
    obj_spider = SpiderMain()
    obj_spider.craw(root_url)